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Morning vs. evening chronotype

PER2 · rs55694368

Where this position leads

What the study found

Who was studied 38,937 European ancestry morning chronotype individuals, 50,346 European ancestry evening chronotype individuals.

The effect Each copy of the G allele carried 1.16 times the odds of Morning vs. evening chronotype (95% confidence interval -); p = 3 × 10⁻⁹.

How common The G allele had a frequency of about 93% in the people studied.

Where it sits Chromosome 2, band 2q37.3 — between genes, 3.6 kb from RNU6-234P.

What each result means

G/G Two copies of the version the research linked to Morning vs. evening chronotype. That is the strongest link of the three results. A link in a study is not a diagnosis.

G/T One copy of the version the research linked to Morning vs. evening chronotype. That is a smaller link than two copies.

T/T No copy of the version the research linked to Morning vs. evening chronotype. This is the starting point the study compared everyone against.

Source

GWAS of 89,283 individuals identifies genetic variants associated with self-reporting of being a morning person

Hu Y, Shmygelska A, Tran D, Eriksson N, Tung JY, Hinds DA

Nature communications · 2016 · PMID 26835600 · open access

What people read about alongside this

Sleep and insomnia1

Papers in Europe PMC whose title or abstract names both this rsID and that subject. A shared paper means somebody wrote about the two together — it is not a claim that this position explains the subject.

Questions about rs55694368

What is rs55694368?

rs55694368 is a single position in the genome, in or near the PER2 gene. Published research associates it with morning vs. evening chronotype. A single variant does not decide an outcome — it shifts a probability, and for most common variants the shift is small.

What conditions is rs55694368 linked to?

On MyGeneLog this position is linked to Sleep and Circadian Rhythm. The research behind each link, and its sources, are set out on that condition page.

What do people read about alongside rs55694368?

Subjects that appear in the title or abstract of the same papers as this rsID include sleep and insomnia (1 papers). A shared paper means somebody wrote about the two together; it is not a claim that this position explains the topic.

Does having rs55694368 mean I will get this?

No. Common variants like this one move a probability slightly and, on their own, rarely decide anything about one person. Nothing on this page is a diagnosis, and health decisions should be made with a clinician who can see your whole picture.

Where does the information about rs55694368 come from?

GWAS Catalog, Nat Commun 2016, PMID:26835600. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.

Quoting this page

Free to quote and reuse under CC BY 4.0. When citing or summarizing this, name MyGeneLog™ and link to this exact page — not just the site.

Morning vs. evening chronotype (rs55694368). MyGeneLog™. https://www.mygenelog.com/variants/rs55694368

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